Centralized power is good (if that's what you want, and it seems like that's the MO of the CCP).
They just need to control it.
They should want Tencent to take over the world - with them in complete control of Tencent (which they basically already are).
Why should the CCP afraid of Tencent getting big instead of trying everything they can to make Tencent and ByteDance etc bigger?